offered to do和offered to doing都可以。Offered to do主動提出做某事；Offered doing 提議做某事。是動詞的兩個不同的發(fā)展階段。凡是需要表示還未發(fā)生的那么就接動詞 to do， 凡是已經(jīng)發(fā)生，或者正在發(fā)生的，那么就用動詞doing。

offer的用法

1)offer作動詞(verb)

(1)offer sth (to sb) (for sth) | offer sb sth 主動提出;自愿給予

【例句】

Josie had offered her services as a guide.

喬西曾表示愿意當向?qū)А?/p>

He offered some useful advice.

他提出了一些有益的建議。

(2)offer sth/sb (up) (to sb) 奉獻，祭獻(給上帝)

【例句】We offered up our prayers for the men's safe return. 我們祈求上蒼保佑他們平安歸來。

2)offer作名詞(noon)

(1)offer (of sth/to do sth) 主動提議;建議

【例句】I took him up on his offer of a loan. 他主動借錢給我，我接受了。

(2)offer (for sth)

【例句】They've decided to accept our original offer. 他們已決定接受我們最初的報價。